Grove - Temp&Humi Sensor
This temperature & humidity sensor provides a pre-calibrated digital output
- Relative Humidity and temperature measurement
- Full range temperature compensation Calibrated
- Digital signal Long term stability
- Long transmission distance
- Low power consumption
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This page covers the low cost DHT temperature & humidity sensors. These sensors are very basic and slow, but are great for some basic data logging. The DHT sensors are made of two parts, a capacitive humidity sensor and a thermistor. There is also a very basic chip inside that does some analog to digital conversion and spits out a digital signal with the temperature and humidity. The digital signal is fairly easy to read using any microcontroller.
There are different versions of the DHT sensor, they look a bit similar and have the same pinout, but have different characteristics.
- Power Supply: 3 to 5V DC, 2.5mA max current use during conversion (while requesting data)
- Operating range: Good for 20-80% humidity readings with 5% accuracy
- Good for 0-50°C temperature readings ±2°C accuracy
- No more than 1 Hz sampling rate (once every second)
- Body size: 15.5mm x 12mm x 5.5mm
- 3 to 5V power and I/O 2.5mA max current use during conversion (while requesting data)
- Good for 0-100% humidity readings with 2-5% accuracy
- Good for -40 to 125°C temperature readings ±0.5°C accuracy
- No more than 0.5 Hz sampling rate (once every 2 seconds)
- Body size: 15.1mm x 25mm x 7.7mm
The DHT22 is a little more accurate. All sensors have a low sampling rate.
They come in different packages, breakoutboards:
- most common : DHT11, DHT22
- SEN11301P, Grove - Temperature&Humidity Sensor (Seeed Studio)
- SEN51035P, Grove - Temperature&Humidity Sensor Pro (Seeed Studio)
- AM2302 , temperature-humidity sensor
- RHT03 , Humidity and Temperature Sensor
Wiring / Connectivity
Connection of the SEN11301P or SEN51035P:
- black - GND (Ground)
- red - VCC (3 to 5V power)
- white - NC (not connected)
- yellow - SIG (Signal or data)
Connection of the DHT11 or DHT22:
Don't forget to place a 5K or 4k7 resistor between VCC and the data pin, to act as a medium-strength pull up on the data line.
- pin 1 - VCC (3 to 5V power)
- pin 2 - Data
- pin 3 - NC (not connected)
- pin 4 - GND
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